Problem
Given a list of daily temperatures T, return a list such that, for each day in the input, tells you how many days you would have to wait until a warmer temperature. If there is no future day for which this is possible, put 0 instead.
For example, given the list of temperatures T = [73, 74, 75, 71, 69, 72, 76, 73], your output should be [1, 1, 4, 2, 1, 1, 0, 0].
Note: The length of temperatures will be in the range [1, 30000]. Each temperature will be an integer in the range [30, 100].
Solution
class Solution {
public:
vector<int> dailyTemperatures(vector<int>& T) {
vector<int> ret(T.size(),0);
stack<int> s;
for(int i = 0;i<T.size();++i)
{
while(!s.empty() && T[s.top()] < T[i])
{
int cur = s.top();
s.pop();
ret[cur] = i - cur;
}
s.push(i);
}
return ret;
}
};